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https://www.readbyqxmd.com/read/28227503/suitability-of-nitinol-electrodes-in-neural-prostheses-such-as-endovascular-neural-interfaces
#1
Yan T Wong, Nicholas L Opie, Sam E John, Giulia Gerboni, Gil S Rind, Stephen M Ronayne, Kate E Fox, Thomas J Oxley, David B Grayden, Yan T Wong, Nicholas L Opie, Sam E John, Giulia Gerboni, Gil S Rind, Stephen M Ronayne, Kate E Fox, Thomas J Oxley, David B Grayden, Sam E John, Stephen M Ronayne, David B Grayden, Nicholas L Opie, Kate E Fox, Giulia Gerboni, Thomas J Oxley, Yan T Wong, Gil S Rind
A major challenge facing neural prostheses is the development of electrodes that are well tolerated by the brain and body. A novel way to circumvent the need to perform an invasive craniotomy and penetration of the blood-brain barrier to implant electrodes, is to guide electrodes up into the cerebral veins and place electrodes on the vessel walls adjacent to neuronal populations. To aid in the development of these stent based devices, microelectrodes manufactured from Nitinol would allow electrodes to be implanted via a catheter and then once deployed, alter their shape to conform to the vessel walls...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227425/mechanical-performances-of-endovascular-aneurysm-repair-strategies-with-main-aortic-and-chimney-grafts
#2
Wei-Ling Chen, Bing-Feng Huang, Ming-Long Yeh, Chung-Dann Kan, Wei-Ling Chen, Bing-Feng Huang, Ming-Long Yeh, Chung-Dann Kan, Ming-Long Yeh, Bing-Feng Huang, Chung-Dann Kan, Wei-Ling Chen
The use of endovascular aneurysm repair (EVAR) strategies for the treatment of complex aortic pathologies is a major area of investigation in modern surgery. EVAR strategies using fenestrated or branched devices provide alternatives to open surgery for patients with aortic pathologies with visceral branch involvement, but their applications have some major limitations. To extend endovascular repair to patients whose anatomy is unfit for branched or fenestrated stent grafts or open repair, parallel graft techniques using chimney grafts (CGs) have been proposed...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227224/cfd-analysis-of-strut-influence-on-blood-flow-in-stent-implanted-left-main-coronary-artery-bifurcation
#3
Yuya Yamada, Takahiro Tsukahara, Masahiro Motosuke, Yusuke Fujino, Yuya Yamada, Takahiro Tsukahara, Masahiro Motosuke, Yusuke Fujino, Takahiro Tsukahara, Yuya Yamada, Yusuke Fujino, Masahiro Motosuke
We numerically studied blood flows in a simulated branching pipe of coronary artery bifurcation, which is affected by stent implantation. We found that stent struts provide effects as guide vanes and blockages on the flow into circumflex branch. The former effect increases the flow rate and shear stress on the arteriosclerosis-prone site. The blockage effect may overwhelm the guide effect depending on a strut position against the inflow.
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226892/a-bifrequent-passive-sensor-system-for-measurement-of-the-pulse-wave-velocity-in-a-stent
#4
Jonathan Schachtele, Jonathan Schachtele, Jonathan Schachtele
In-stent restenosis (ISR) is a frequent complication after stent implantation. Recently, a passive sensor system for integration into a stent has been presented, which is designed to detect an ISR early by measuring the local pulse wave velocity (PWV). This system is based on two pressure sensitive transponders, the resonance frequency of which hits the frequency of a magnetic field generated by an externally applied transceiver coil during a pulse cycle. This method is limited in applicability by the largest PWV it can measure...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226721/overcoming-spatio-temporal-limitations-using-dynamically-scaled-in-vitro-pc-mri-a-flow-field-comparison-to-true-scale-computer-simulations-of-idealized-stented-and-patient-specific-left-main-bifurcations
#5
Susann Beier, John Ormiston, Mark Webster, John Cater, Stuart Norris, Pau Medrano-Gracia, Alistair Young, Kathleen Gilbert, Brett Cowan, Susann Beier, John Ormiston, Mark Webster, John Cater, Stuart Norris, Pau Medrano-Gracia, Alistair Young, Kathleen Gilbert, Brett Cowan, Stuart Norris, Brett Cowan, Pau Medrano-Gracia, Kathleen Gilbert, Mark Webster, Alistair Young, Susann Beier, John Cater, John Ormiston
The majority of patients with angina or heart failure have coronary artery disease. Left main bifurcations are particularly susceptible to pathological narrowing. Flow is a major factor of atheroma development, but limitations in imaging technology such as spatio-temporal resolution, signal-to-noise ratio (SNRv), and imaging artefacts prevent in vivo investigations. Computational fluid dynamics (CFD) modelling is a common numerical approach to study flow, but it requires a cautious and rigorous application for meaningful results...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226350/-value-of-endoscopy-application-in-the-management-of-complications-after-radical-gastrectomy-for-gastric-cancer
#6
Yiqun Zhang, Pinghong Zhou
Endoscopy plays an important role in the diagnosis and treatment of postoperative complications of gastric cancer. Endoscopic intervention can avoid the second operation and has attracted wide attention. Early gastric anastomotic bleeding after gastrectomy is the most common. With the development of technology, emergency endoscopy and endoscopic hemostasis provide a new treatment approach. According to the specific circumstances, endoscopists can choose metal clamp to stop bleeding, electrocoagulation hemostasis, local injection of epinephrine or sclerotherapy agents, and spraying specific hemostatic agents...
February 25, 2017: Zhonghua Wei Chang Wai Ke za Zhi, Chinese Journal of Gastrointestinal Surgery
https://www.readbyqxmd.com/read/28224087/fragmentation-of-severely-encrusted-ureteral-stent-indwelled-for-4%C3%A2-years-in-a-boy
#7
Guangjing Tao, Guojun Wu, Lijun Yang, Fuli Wang, Chao Han, Fei Liu, Jianlin Yuan
Four years ago, a 9-year-old boy received percutaneous nephrolithotomy (PCNL) and a 5F DJS was placed thereafter. The DJS was neglected until it caused serious complications including encrustation involving the whole stent, a 5-cm-diameter vesical stone, fragmentation of DJS, and serious urinary tract infection. For this rare and complex case of pediatric lithotomy, we combined PCNL with the suprapubic cystolithotomy for complete removal of the encrusted stent and associated stones without any complications and the patient was rendered stone- and stent-free safely...
May 2017: Urology Case Reports
https://www.readbyqxmd.com/read/28223737/pancreaticoduodenectomy-secondary-stenting-of-the-celiac-trunk-after-inefficient-median-arcuate-ligament-release-and-reoperation-as-an-alternative-to-simultaneous-hepatic-artery-reconstruction
#8
Théophile Guilbaud, Jacques Ewald, Olivier Turrini, Jean Robert Delpero
In patients undergoing pancreaticoduodenectomy (PD), unrecognized hemodynamically significant celiac axis (CA) stenosis impairs hepatic arterial flow by suppressing the collateral pathways supplying arterial flow from the superior mesenteric artery and leads to serious hepatobiliary complications due to liver and biliary ischemia, with a high rate of mortality. CA stenosis is usually due to an extrinsic compression by a previously asymptomatic median arcuate ligament (MAL). MAL is diagnosed by computerized tomography in about 10% of the candidates for PD, but only half are found to be hemodynamically significant during the gastroduodenal artery clamping test with Doppler assessment, which is mandatory before any resection...
February 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28223049/outcomes-of-coronary-artery-bypass-and-stents-for-unprotected-left-main-coronary-stenosis
#9
Yin-Shu Chang, Jia-Xiang Wang, Da-Wei Chang
BACKGROUND: This study assessed the short-, medium-, and long-term outcomes of coronary artery bypass grafting vs stenting for patients with unprotected left main coronary artery disease through a meta-analysis of randomized controlled trials. METHODS: PubMed, Embase, Scopus, Web of Science, Cochrane Library, and major conference proceedings databases were systematically searched for randomized controlled trials of coronary artery bypass grafting compared with stents in unprotected left main coronary artery disease...
February 18, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28223041/is-routine-hepaticojejunostomy-at-the-time-of-unplanned-surgical-bypass-required-in-the-era-of-self-expanding-metal-stents
#10
Roberta Angelico, Shakeeb Khan, Bobby Dasari, Ravi Marudanayagam, Robert P Sutcliffe, Paolo Muiesan, John Isaac, Darius Mirza, Keith J Roberts
BACKGROUND: Hepaticojejunostomy is routinely performed in patients when inoperable disease is found at planned pancreatoduodenectomy; however, in the presence of self-expanding metal stent (SEMS) hepaticojejunostomy may not be required. The aim of this study was to assess biliary complications and outcomes in patients with unresectable disease at time of planned pancreaticoduodenectomy stratified by the management of the biliary tract. MATERIAL AND METHODS: Retrospective analysis of patients undergoing surgery in January 2010-December 2015...
February 17, 2017: HPB: the Official Journal of the International Hepato Pancreato Biliary Association
https://www.readbyqxmd.com/read/28222992/a-geometric-reappraisal-of-proximal-landing-zones-for-thoracic-endovascular-aortic-repair-according-to-aortic-arch-types
#11
Massimiliano M Marrocco-Trischitta, Hector W de Beaufort, Francesco Secchi, Theodorus M van Bakel, Marco Ranucci, Joost A van Herwaarden, Frans L Moll, Santi Trimarchi
OBJECTIVE: This study assessed whether the additional use of the aortic arch classification in type I, II, and III may complement Ishimaru's aortic arch map and provide valuable information on the geometry and suitability of proximal landing zones for thoracic endovascular aortic repair. METHODS: Anonymized thoracic computed tomography scans of healthy aortas were reviewed and stratified according to the aortic arch classification, and 20 of each type of arch were selected...
February 17, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28222987/french-multicenter-experience-with-the-gore-tigris-vascular-stent-in-superficial-femoral-and-popliteal-arteries
#12
Maxime Sibé, Adrien Kaladji, Claire Boirat, Alain Cardon, Xavier Chaufour, Jean-Pierre Bossavy, Bertrand Saint-Lebes
BACKGROUND: Preliminary results in small single-center studies after stenting with the GORE TIGRIS Vascular Stent (W. L. Gore & Associates, Flagstaff, Ariz) show promising short-term primary patency rates, but larger, multicenter studies are needed. This study therefore investigated the performance of the GORE TIGRIS Vascular Stent at three different centers in France in patients with symptomatic peripheral artery disease. METHODS: This retrospective, single-arm, multicenter cohort study included 215 patients with peripheral artery disease (Rutherford-Becker category 2-6) who were treated with the GORE TIGRIS Vascular Stent, a dual-component stent consisting of a nitinol wire frame combined with a fluoropolymer-interconnecting structure...
February 17, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28222985/concurrent-renal-artery-stent-during-endovascular-infrarenal-aortic-aneurysm-repair-confers-higher-risk-for-30-day-acute-renal-failure
#13
Besma Nejim, Isibor Arhuidese, Muhammmad Rizwan, Lana Khalil, Satinderjit Locham, Devin Zarkowsky, Philip Goodney, Mahmoud B Malas
OBJECTIVE: Concurrent renal artery angioplasty and stenting (RAAS) during endovascular aneurysm repair (EVAR) of infrarenal abdominal aortic aneurysm (AAA) has been practiced in an attempt to maintain renal perfusion. The aim of this study was to identify the current practice of RAAS during EVAR and its effect on perioperative renal outcome. METHODS: Patients with infrarenal AAA were identified from the American College of Surgeons National Surgical Quality Improvement Program (ACS NSQIP, 2011-2014) database...
February 17, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28222442/transvesical-suprapubic-externalization-of-ureteral-stents-introduction-of-a-surgical-innovation-at-the-development-stage
#14
Holger Gerullis, Klaus Schwartmann, Thorsten H Ecke, Evangelos Georgas, Philip Herberg, Alexander Winter, Friedhelm Wawroschek, Dimitri Barski, Thomas Otto
BACKGROUND AND OBJECTIVES: In this study, we describe our first experiences with the new method of transvesical suprapubic externalization of ureteral stents. This method is assessed in patients with incurable ureteral obstruction and concomitant bladder dysfunction, and is classified according to the Idea, Development, Exploration, Assessment, Long-Term Study (IDEAL) recommendations. PATIENTS AND METHODS: From 2009 to 2015, transvesical suprapubic externalization of ureteral stents was applied in 14 (8 males, 6 females) patients with incurable ureteral obstruction of malignant (n = 9, 64%) or benign (n = 5; 36%) etiology...
February 22, 2017: Urologia Internationalis
https://www.readbyqxmd.com/read/28221670/endophlebectomy-of-the-common-femoral-vein-and-arteriovenous-fistula-creation-as-adjuncts-to-venous-stenting-for-post-thrombotic-syndrome
#15
M A F de Wolf, H Jalaie, J H H van Laanen, R L M Kurstjens, M J S Mensinck, M J de Geus, A Gombert, R de Graaf, C H A Wittens
BACKGROUND: Good results have been reported for angioplasty and stenting of post-thrombotic lesions of the iliac and proximal femoral veins. If lesions at the origin of the superficial femoral and profunda veins are stented, the intraluminal synechiae can be pushed against the orifices of inflow vessels, potentially decreasing stent inflow. Surgical disobliteration of the common femoral vein (endophlebectomy) has been suggested to mitigate this problem. Because of a temporary increase in thrombogenicity, this procedure may be accompanied by arteriovenous fistula creation...
February 21, 2017: British Journal of Surgery
https://www.readbyqxmd.com/read/28221154/prospective-outcomes-of-11-13ch-ultra-mini-percutaneous-nephrolithotomy-ump-a-consecutive-cohort-study
#16
Janak D Desai
: Ultra mini PCNL (UMP) has been described as a less invasive technique of PCNL for the treatment of small to medium sized stones in attempt to reduce the surgical morbidity. OBJECTIVE: Evaluate prospectively the outcomes of UMP. METHODS: Single surgeon prospective concurrent cohort study of UMP in India. Effectiveness was assessed by stone-free rates, operative time, complications including transfusion, sepsis rates, length of stay and analgesic requirements...
January 2017: Archivos Españoles de Urología
https://www.readbyqxmd.com/read/28220593/robot-assisted-approach-to-w-configuration-urinary-diversion-a-step-by-step-technique
#17
Ahmed A Hussein, Youssef E Ahmed, Justen D Kozlowski, Paul May, John Nyquist, Sandra Sexton, Leslie Curtin, James O Peabody, Hassan Abol-Enein, Khurshid A Guru
INTRODUCTION: To describe a detailed step-by-step approach of our technique to robot-assisted intracorporeal "W" orthotopic ileal neobladder (ICNB). METHODS: Five patients underwent robot-assisted radical cystectomy (RARC), extended pelvic lymph node dissection (ePLND) and ICNB. ICNB was divided into 6 key steps to facilitate and enable a detailed analysis and auditing of the technique. No conversion to open surgery was required. Timing for each step was noted. All patients had at least 3 months of follow up...
February 20, 2017: BJU International
https://www.readbyqxmd.com/read/28220463/can-we-improve-the-outcomes-of-multivessel-disease-using-modified-syntax-and-residual-syntax-scores
#18
REVIEW
Alfredo E Rodriguez, Carlos Fernandez-Pereira, Juan Mieres, Javier Mendoza, Florencia Sartori
PURPOSE OF REVIEW: In spite of the benefits of drug eluting (DES), these advantages were not translated to better outcome when percutaneous coronary interventions (PCI) were compared with coronary artery bypass surgery. PCI strategy allowing stent deployment in all intermediate lesions including small vessels together with DES design may be the reasons of these findings. RECENT FINDINGS: Recently randomized and observational studies demonstrated using functional flow reserve analysis, residual Syntax score risk, or residual ERACI score after PCI that a reasonably incomplete revascularization was associated with good long-term outcome and low events rate at follow-up...
March 2017: Current Cardiology Reports
https://www.readbyqxmd.com/read/28220461/new-generation-coronary-stents-current-data-and-future-directions
#19
REVIEW
Ankur Kalra, Hasan Rehman, Sahil Khera, Braghadheeswar Thyagarajan, Deepak L Bhatt, Neal S Kleiman, Robert W Yeh
PURPOSE OF REVIEW: Drug-eluting stents are the mainstay in the treatment of coronary artery disease using percutaneous coronary intervention. Innovations developed to overcome the limitations of prior generations of stents include biodegradable polymer stents, drug-eluting stents without a polymer, and bioabsorbable scaffolds. Our review briefly discusses the clinical profiles of first- and second-generation coronary stents, and provides an up-to-date overview of design, technology, and clinical safety and efficacy profiles of newer generation coronary stents discussing the relevant clinical trials in this rapidly evolving area of interventional cardiology...
March 2017: Current Atherosclerosis Reports
https://www.readbyqxmd.com/read/28219914/nickel-associated-delayed-multiple-white-matter-lesions-after-stent-assisted-coil-embolization-of-intracranial-unruptured-aneurysm
#20
Hun Soo Park, Ichiro Nakagawa, Shohei Yokoyama, Daisuke Wajima, Takeshi Wada, Yasushi Motoyama, Kimihiko Kichikawa, Hiroyuki Nakase
Metal-induced encephalopathy after stent-assisted coil embolization is extremely rare. The present report describes two patients who presented with symptomatic intracranial parenchymal edematous lesions after stent-assisted coil embolization. A 64-year-old woman underwent stent-assisted coil embolization for a left internal carotid artery aneurysm; 21 days after the procedure she presented with right hand weakness and MRI revealed multifocal white matter lesions. Another woman aged 52 years underwent stent-assisted coil embolization for right vertebral artery aneurysm; 18 days after the procedure she presented with left-sided sensory disturbance and MRI demonstrated multiple white matter lesions...
February 20, 2017: BMJ Case Reports
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